Merge pull request #535 from jpetazzo/slides-docker-pods-anatomy

Slides docker pods anatomy

slides/containers/Pods_Anatomy.md

@@ -0,0 +1,47 @@
+# Container Super-structure
+
+- Multiple orchestration platforms support some kind of container super-structure.
+
+  (i.e., a construct or abstraction bigger than a single container.)
+
+- For instance, on Kubernetes, this super-structure is called a *pod*.
+
+- A pod is a group of containers (it could be a single container, too).
+
+- These containers run together, on the same host.
+
+  (A pod cannot straddle multiple hosts.)
+
+- All the containers in a pod have the same IP address.
+
+- How does that map to the Docker world?
+
+---
+
+class: pic
+
+## Anatomy of a Pod
+
+![Pods](images/kubernetes_pods.svg)
+
+---
+
+## Pods in Docker
+
+- The containers inside a pod share the same network namespace.
+
+  (Just like when using `docker run --net=container:<container_id>` with the CLI.)
+
+- As a result, they can communicate together over `localhost`.
+
+- In addition to "our" containers, the pod has a special container, the *sandbox*.
+
+- That container uses a special image: `k8s.gcr.io/pause`.
+
+  (This is visible when listing containers running on a Kubernetes node.)
+
+- Containers within a pod have independent filesystems.
+
+- They can share directories by using a mechanism called *volumes.*
+
+  (Which is similar to the concept of volumes in Docker.)

slides/images/kubernetes_pods.drawio

@@ -0,0 +1 @@
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slides/intro-fullday.yml

@@ -69,6 +69,7 @@ chapters:
   #- containers/Containers_From_Scratch.md
 -
   - containers/Container_Engines.md
+  - containers/Pods_Anatomy.md
   #- containers/Ecosystem.md
   - containers/Orchestration_Overview.md
   - shared/thankyou.md

slides/intro-selfpaced.yml

@@ -60,6 +60,7 @@ chapters:
   - containers/Copy_On_Write.md
   #- containers/Containers_From_Scratch.md
 - - containers/Container_Engines.md
+  - containers/Pods_Anatomy.md
   - containers/Ecosystem.md
   - containers/Orchestration_Overview.md
   - shared/thankyou.md